## Sizing an Exhaust Fan

Sizing an Exhaust Fan

The following data should help you in determining the CFM capacity of a fan for a specific room. The values are easy to calculate. There are minimum standards to follow. Here is where they are put to use. Let's take a small kitchen for an example. Say the kitchen measures 10 feet by 12 feet with an eight foot ceiling. That computes to 960 cubic feet of air in the room. The minimum requirements say that this air should be changed 15 times an hour. This means that a fan must have the ability to move 14,400 cubic feet of air in an hour. Since there are 60 minutes in an hour, we must divide the 14,400 by 60 to get CFM (cubic feet per minute). Cubic feet of 14,400 per hour divided by 60 equals 240 CFM. Nothing to it! Table Values courtesy of Nutone, Inc.

The room area is listed in square feet. All values below the listed room size represent the fan's minimum capacity shown in cubic feet per minute.

Room Area in Square Feet |
Fan Capacity in CFM for a KITCHEN | Fan Capacity in CFM for a BATHROOM | Fan Capacity in CFM for Other Rooms |

35 | N/A | 40 | N/A |

45 | N/A | 50 | N/A |

55 | N/A | 60 | 45 |

65 | N/A | 70 | 55 |

75 | 150 | 80 | 60 |

85 | 170 | 90 | 70 |

95 | 190 | 100 | 80 |

100 | 200 | 110 | 80 |

125 | 250 | 140 | 100 |

150 | 300 | 160 | 120 |

175 | 350 | N/A | 140 |

200 | 400 | N/A | 160 |

225 | 450 | N/A | 180 |

250 | 500 | N/A | 200 |

310 | 620 | N/A | 250 |

375 | 750 | N/A | 300 |

435 | 870 | N/A | 350 |

500 | 1,000 | N/A | 400 |

560 | 1,120 | N/A | 450 |

625 | 1,250 | N/A | 500 |

685 | 1,370 | N/A | - |

Column B98

What size (CFM) remote kitchen exhaust fan should I use to properly vent a 4- burner gas cooktop? The distance from the exhaust above the stove to fan on the outside wall is 14 feet and there are 3 x 90 degree bends to get to the outer wall to vent.

Does an induction cooktop require less CFM venting?

Thanks

What do the fan manufacturers' charts say??????????

kitchen is 8'x8' and 10 ft high.ie say 650 Ccu ft of air.air is to be changed 15 times an hour. therefore fan must move650x15 equuals to

say10000times. on dividing by 60, we get160cfm

pl advise will 150 cfm will be sufficent or shud igo higher cfm

is dimension fan meaningfu like 6'/8'/10'/12' size or shape square / square/ is relevant

Pl advise on urgent basi and oblige.

Thank you

Hi, I am working on a school project, how to design a heating and cooling for a commercial building of 60, 000 sq ft. Any commercial building will do, I am planning on design a system for a super market, I don't how to start this project, perhaps you can give me some ideas thanks.

I want to design a machine , which needs exhaust fan . This machine should be placed in lawn or some open area to capture the air surrounding that machine. How will I know the capacity as amount of air is not known